feat: consistent username format

src/app/annuaire/result-list/result-list.component.html

src/app/annuaire/result-list/result-list.component.ts

src/app/contact/contact.component.ts

src/app/header/header.component.html

src/app/header/header.component.ts

...-structure-member/profile-structure-member.component.html

src/app/profile/profile.component.html

src/app/profile/profile.component.ts

src/app/services/auth.service.ts

src/app/shared/pipes/index.ts

src/app/shared/pipes/userName.pipe.ts

...onents/structure-details/structure-details.component.html